Disk replaced hot swap, resynced, volume degraded

[mlupo]

I replaced a disk drive with the exact same drive model.  The NAS resynced the drive, but volume is still showing as degraded.  Both drives show status as green. OS 6.6.1

[StephenB]

Download the logs and look in mdstat.log.  See if the new drive is marked as a spare.

[mlupo]

There are no spare drives.

Also, when I attempt to back up to the drive using Acronis, it gives me a network disconnected error.  Using data files on ReadyNAS work fine without any network issues.

[StephenB]

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@mlupo wrote:

There are no spare drives.

Any hint in mdstat on what the volume is degraded then?

[mlupo]

Personalities : [raid0] [raid1] [raid10] [raid6] [raid5] [raid4]
md127 : active raid5 sda3[0] sdb3[2]
5850829568 blocks super 1.2 level 5, 64k chunk, algorithm 2 [3/2] [U_U]

md1 : active raid1 sda2[0] sdb2[1]
523712 blocks super 1.2 [2/2] [UU]

md0 : active raid1 sda1[0] sdb1[2]
4190208 blocks super 1.2 [3/2] [UU_]

unused devices: <none>
/dev/md/0:
Version : 1.2
Creation Time : Mon Mar 2 19:11:47 2015
Raid Level : raid1
Array Size : 4190208 (4.00 GiB 4.29 GB)
Used Dev Size : 4190208 (4.00 GiB 4.29 GB)
Raid Devices : 3
Total Devices : 2
Persistence : Superblock is persistent

Update Time : Sun Jan 29 14:58:29 2017
State : clean, degraded
Active Devices : 2
Working Devices : 2
Failed Devices : 0
Spare Devices : 0

Name : 2fe519e1:0 (local to host 2fe519e1)
UUID : 48ff1028:6a05d569:f8e9a1f6:2db232a7
Events : 108312

Number Major Minor RaidDevice State
0 8 1 0 active sync /dev/sda1
2 8 17 1 active sync /dev/sdb1
4 0 0 4 removed
/dev/md/1:
Version : 1.2
Creation Time : Thu Jan 26 10:16:41 2017
Raid Level : raid1
Array Size : 523712 (511.44 MiB 536.28 MB)
Used Dev Size : 523712 (511.44 MiB 536.28 MB)
Raid Devices : 2
Total Devices : 2
Persistence : Superblock is persistent

Update Time : Fri Jan 27 14:36:21 2017
State : clean
Active Devices : 2
Working Devices : 2
Failed Devices : 0
Spare Devices : 0

Name : 2fe519e1:1 (local to host 2fe519e1)
UUID : dc2be79b:e4e95d64:bc1e5cb1:9ec216ee
Events : 19

Number Major Minor RaidDevice State
0 8 2 0 active sync /dev/sda2
1 8 18 1 active sync /dev/sdb2
/dev/md/data-0:
Version : 1.2
Creation Time : Mon Mar 2 19:11:47 2015
Raid Level : raid5
Array Size : 5850829568 (5579.79 GiB 5991.25 GB)
Used Dev Size : 2925414784 (2789.89 GiB 2995.62 GB)
Raid Devices : 3
Total Devices : 2
Persistence : Superblock is persistent

Update Time : Sat Jan 28 15:15:12 2017
State : clean, degraded
Active Devices : 2
Working Devices : 2
Failed Devices : 0
Spare Devices : 0

Layout : left-symmetric
Chunk Size : 64K

Name : 2fe519e1:data-0 (local to host 2fe519e1)
UUID : 18ac651b:849da6a1:c7846d8c:bc2c0f72
Events : 10257

Number Major Minor RaidDevice State
0 8 3 0 active sync /dev/sda3
2 0 0 2 removed
2 8 19 2 active sync /dev/sdb3

[mlupo]

Power light continues to blink as well, even though it has resynced.  I have not tried balancing, defraging or scrubbing.

[StephenB]

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@mlupo wrote:

/dev/md/data-0:
Version : 1.2
Creation Time : Mon Mar 2 19:11:47 2015
Raid Level : raid5
Array Size : 5850829568 (5579.79 GiB 5991.25 GB)
Used Dev Size : 2925414784 (2789.89 GiB 2995.62 GB)
Raid Devices : 3
Total Devices : 2
Persistence : Superblock is persistent

What ReadyNAS model is this?

Were there ever three disks installed?

[mlupo]

RN10200.  Installed two drives on purchase.  Replaced the #2 drive last Thursday. 

[StephenB]

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@mlupo wrote:

RN10200. 

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Right. Something went wrong during the hot swap, since it's physically impossible to have a RAID-5 array.

You could contact support (they likely will charge), or you could back up the data and do a factory reset with the two drives in place.

Though perhaps wait a little while and see if someone from Netgear offers to take a look.  This is very unusual, so they might.

[mlupo]

StephenB,

Thanks for your help.

[mdgm-ntgr]

I would think backup, factory reset (wipes all data, settings, everything) and restoring your data from backup would be the best way forward.